It's only useful to those who haven't read the article. To those who have, it adds only noise (at best, filler) to the discussion. Beside, it sets a poor precedent. Novelty accounts are "OK" at Reddit and 99% of them only decrease quality. It'd be nice for them not to be "OK" here.

But there's a high cost to this kind of "usefulness".

I don't even know anymore.

I thought it was an excellent summary. What kind of cost do you perceive/predict?